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H2RSPET: a 0.5 mm resolution high-sensitivity small-animal PET scanner, a simulation study.

Youfang Lai1, Qian Wang2, Shiwei Zhou1

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Physics in Medicine and Biology
|February 11, 2021
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Summary

This study simulated four total-body small-animal PET scanners to achieve high spatial resolution and sensitivity for mouse and rat imaging. Results show all scanners achieve sub-0.5 mm resolution, with crystal thickness impacting sensitivity and off-center resolution.

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Area of Science:

  • Nuclear Medicine
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Developing total-body small-animal PET systems is crucial for advancing preclinical research.
  • Existing systems require optimization for high spatial resolution (∼0.5 mm) and sensitivity (>10%) for mouse and rat studies.

Purpose of the Study:

  • To simulate and compare the performance of four total-body small-animal PET scanner designs.
  • To evaluate spatial resolution and sensitivity characteristics.
  • To investigate the impact of depth-of-interaction (DOI) resolution on spatial resolution.

Main Methods:

  • Utilized the graphical processing unit-based Monte Carlo simulation package (gPET) for scanner simulations.
  • Designed four scanners with 128 DOI encoding dual-ended readout detectors using lutetium yttrium oxyorthosilicate (LYSO) arrays.
  • Varied scanner configurations (ring diameter, axial length, crystal thickness) and analyzed performance metrics.

Main Results:

  • All simulated scanners achieved spatial resolution better than 0.5 mm at the center of the field-of-view (FOV).
  • Radial resolution was significantly influenced by DOI resolution and radial offset.
  • Thinner crystals (10 mm) offered better off-center resolution, while thicker crystals (20 mm) provided double the sensitivity (∼20% vs. ∼10%).

Conclusions:

  • The 110 mm diameter systems are cost-effective for total-body mouse studies.
  • The 160 mm diameter systems are suitable for both total-body mouse and rat studies.
  • Scanner design parameters, including crystal thickness and DOI resolution, critically affect PET system performance.